docs(vue-sdk): simplify getting started docs

[roncohen]

• Simplify getting started example
• Remove fallback features as they only serve to make folks confused and they are not really being used.

[Copilot]

Pull Request Overview

This PR simplifies the getting started guide in the Vue SDK README by removing the feedback fallback features and example, and adds a pointer to reference docs.

• Removes the "Give feedback!" button and its wrapping <div> closing tag
• Deletes the fallbackFeatures section and its example block
• Adds a generic pointer to the reference docs

Comments suppressed due to low confidence (3)

packages/vue-sdk/README.md:113

• [nitpick] Trailing comma remains after this sentence now that the following bullet was removed. It should end with a period.

  > If you specify `company` and/or `user` they must have at least the `id` property, otherwise they will be ignored in their entirety. You should also supply anything additional you want to be able to evaluate feature targeting against,

packages/vue-sdk/README.md:185

• [nitpick] Consider adding a direct link or path to the reference documentation so readers can navigate immediately to the detailed API descriptions.

See the reference docs for details.

packages/vue-sdk/README.md:49

• The closing </div> tag for the <div v-if="huddle.isEnabled"> block was removed. This will break the template—re-add </div> before </template>.

</template>